Elevator – industrial lift truck – or stationary lift for vehicle – Having specific guide shoe – With roller
Reexamination Certificate
2000-10-20
2002-11-05
Ellis, Christopher P. (Department: 3652)
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific guide shoe
With roller
C187S409000, C187S292000
Reexamination Certificate
active
06474449
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an elevator and a guide device for an elevator having an actuator to reduce the vibration of a cage.
2. Description of the Related Art
In an elevator, an elevator car is guided by guide rails in such a manner that guide elements of guide devices provided in the elevator car including a cage come into contact with the guide rails vertically arranged on side walls of a hoistway. However, errors occur in the installation of the guide rails, and further deflection is caused in the guide rail by a load given to the cage, and furthermore a small level difference and winding are caused in the guide rail by the change with age. Therefore, when the cage of the elevator car is run, it is affected by an external disturbance caused by the level difference and winding of the guide rail. Accordingly, the cage is vibrated in the up and down direction (elevating direction) and the side to side direction (direction perpendicular to the elevating direction). As a result, passengers feel uncomfortable.
Conventionally, in order to reduce the longitudinal and the lateral vibration, an elastically supporting member or a vibration isolating member for reducing an input of displacement given by the guide rail is arranged between the cage and the car frame or between the car frame and the guide element. In order to provide a great effect of isolation of vibration, it is necessary to reduce the rigidity of the elastically supporting member and the vibration isolating member. On the other hand, in order to prevent the occurrence of interference of the cage with other components when an imbalance load is given to the cage, it is necessary to somewhat increase the rigidity. For the above reasons, it is difficult to design an elevator by which a sufficiently high vibration isolating effect can be provided and at the same time no problems are caused even if an imbalanced load is given to the cage.
Accordingly, when the elastically supporting member or the vibration isolating member, by which an input of displacement given to the cage is only passively reduced, is provided, it is impossible to solve the problems caused when the elevating speed of an elevator is increased.
Therefore, attention is given to an active vibration isolating method, in which a force to suppress vibration is given from the outside, instead of the passive vibration isolating method. Especially, there is proposed an active vibration isolating method in which an electric current is made to flow in a coil so as to generate a magnetic field at the center (axial center) of the coil, and vibration is reduced by a magnetic force when a reaction bar made of magnetic body is arranged at a position opposed to the magnetic field.
FIG. 13
is a cross-sectional view showing an example of an elevator device to which the above active vibration isolating method is applied, which is described in Japanese Unexamined Patent Publication No. 6-92573.
As shown in
FIG. 13
, there is provided a car frame
101
for supporting a cage, and a support base
102
is fixed to the car frame
101
. A support arm
103
extending in the vertical direction (elevating direction) is pivotally attached to this support base
102
. In this support arm
103
, there is provided a roller
105
that rotates coming into contact with a rail
104
vertically arranged on a side wall of a hoistway. An arm
106
(reaction bar) extending in the horizontal direction is pivotally attached to the support base
102
, and this arm
106
is connected with the support arm
103
. Due to the above structure, when the arm
106
is driven, the support arm
103
is driven.
In the car frame
101
under the arm
106
, there is provided an electromagnetic induction member
107
round which a coil is wound. This electromagnetic induction member
107
round which a coil is wound composes a stationary section of an actuator. On the other hand, the arm
106
located above this electromagnetic induction member
107
is made of magnetic substance. This arm
106
(reaction bar) composes an movable section of the actuator.
In order to suppress the occurrence of vibration of the cage, an electric current is made to flow in the coil so as to generate a magnetic field in the electromagnetic induction member
107
in the vertical direction. The arm
106
is attracted by a magnetic force generated by this magnetic field in the vertical direction. As a result, the support arm
103
is driven, so that an intensity of the exciting force transmitted to the car frame
101
can be reduced. In this connection, at this time, a magnetic field in the vertical direction is generated by the electromagnetic induction member
107
, that is, a magnetic field is generated on the moving plane of the arm
106
.
Due to the above structure of the conventional elevator, a positional relation between the movable section and the stationary section of the actuator is changed by a static displacement by which the cage is tilted by an imbalance load and also by a dynamic displacement by which a position of the movable section of the actuator is changed by the drive of the actuator. Therefore, compared with a case in which the static and the dynamic displacement are not caused, a magnetic force given to the movable and the stationary section of the actuator is changed.
Accordingly, the magnetic force generated in the case of the static displacement and the magnetic force generated in the case of the dynamic displacement are different from each other. However, when the actuator is controlled, a control method is adopted which is suitable for a case in which no displacements are caused. Therefore, it is impossible to conduct an appropriate control. As a result, a drive force of the actuator can not act properly. It can be considered to adopt a method in which it is judged whether the static displacement and the dynamic displacement exist or not. However, when the above method is adopted, it is necessary to conduct a complicated and difficult control.
SUMMARY OF THE INVENTION
The present invention has been accomplished to solve the above problems. It is an object of the present invention to provide an elevator and a guide device of the elevator provided with an actuator characterized in that: a drive force to drive the actuator acts properly even when the static and the dynamic displacement are caused so that a sufficiently high vibration isolating effect can be provided.
The present invention provides an elevator comprising: an elevator car including a cage which runs in a hoistway along a pair of rails vertically arranged on side walls in the hoistway; and a plurality of guide devices for guiding the elevator car along with the pair of rails, attached onto the rail sides of the elevator car, each guide device including: a guide lever pivotally attached to a support member fixed to the elevator car or pivotally attached to the elevator car, so that the guide lever can be driven on a moving plane; a guide element for guiding the elevator car along the rail, being attached to the guide lever and coming into contact with the rail vertically arranged on the side wall of the hoistway; and an actuator device having a stationary actuator part fixed to the support member or the elevating member and also having a moving actuator part fixed to the guide lever and driven on the moving plane, wherein one of the moving actuator part and the stationary actuator part is a magnet for generating a magnetic field crossing a drive direction of the moving actuator part, the other of the moving actuator part and the stationary actuator part is a coil arranged so that the coil can be influenced by the magnetic field, and a Lorentz's force for driving the moving actuator part in the drive direction of the moving actuator part is generated by supplying an electric current in the coil when the elevator car is vibrating, so that the guide lever is driven by the Lorentz's force so as to suppress the vibration of the elevator car.
The magnet is arranged so that it can gen
Okamoto Ken-ichi
Utsunomiya Kenji
Yumura Takashi
Ellis Christopher P.
Mitsubishi Denki & Kabushiki Kaisha
Tran Thuy V.
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